"The King of Fighters 97" is a classic arcade game launched by SNK, and it is also a part of the "King of Fighters" series of games. After inserting the coin to start the game, the player can choose "EXTRA" or "ADV" mode. The main difference between the two modes lies in the game's system mechanics and combat strategies.
The "EXTRA" mode is a mode from the earlier "King of Fighters" series, which uses a traditional power-up system. In this mode, the player's energy bar increases when taking damage or performing certain actions, and when the energy bar is full, the player can perform a powerful nirvana. In addition, the "EXTRA" mode also has a unique movement mechanism, namely "dash forward" and "jump backward", which makes the rhythm of the battle relatively slow and more inclined to defensive game strategy.
In contrast, "ADV" mode introduces a completely new "energy storage" system. In this mode, players can accumulate energy by attacking enemies or defending against enemy attacks, and when the energy is full, it will be stored in a specific energy slot. This means that players can use these energies at critical moments to perform powerful attacks. In addition, the "ADV" mode has a new move called "Dodge", which makes the combat more paced and more aggressive.
For example, in "EXTRA" mode, let's say you're using Terry Bogard, your energy bar is full, and you can choose to use his super nirvana "Power Geyser" to defeat your opponent. In this mode, you need more defense and patience to wait for the best counterattack opportunity. It may take a bit more time to get used to this slow-paced fighting style, but once you get the hang of it, you'll be able to turn the tide of battle with powerful nirvana moves.
Conversely, in "ADV" mode, assuming you're using Kyo Kusanagi, you might attack your opponent more aggressively to build up energy. When you've stored enough energy, you can use Kyo's super nirvana "Orochi Nagi" at any time to deal massive damage to your opponent. In this mode, you need to look for offensive opportunities more actively in order to accumulate energy faster.